Adjustable tap or reamer wrench



W. W. MARSHALL.

ADAJUSIABLE TAP OR REAMER WRENCH.

APPLICATION FILED SEPT- 27, 1920.

Patented Oct. 17, 1922 Patented Get. 17, 1922.

STATES WARREN W. MARSHALL, OF NEW BRITAIN, CONNECTICUT.

ADJUSTABLE TAP OB REAMER IT/BENCH.

Application filed September 27, 1920. Serial No. 413,114.

T 0 aZZ whom it may concern Be it knownthat I, WYARREN W. MAR- SHALL, acitizen of the United States, residing at New Britain, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Adjustable Tap or Reamer renches; and I do declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

My invention relates to improvements in wrenches or handles foroperating threadcutting taps, reame-rs, and analogous tools, and theprincipal object of the invention is to provide an extremely simple andinexpensive, yet a highly efficient and desirable wrench of thischaracter which may be adjusted to difierent size tools by simply turn-111 a single screw.

in carrying out the above end, I provide a plurality of jaws which areadjustable one upon another when one of said jaws is shifted, and afurther object is to provide means for positively shifting said one jawin either direction, whereby all of the jaws may be either expanded orcontracted by movement of the same control device.

With the foregoing in view, the invention resides in the novelconstruction and arrangement of parts hereinafter described and claimed,the descriptive matter being supplemented by the accompanying drawings.

Figure l is a plan view of a wrench constructed in accordance with myinvention showing the same adjusted for a comparatively small tool.

Figure 2 is an elevation with parts removed and in section, showing thedevice adjusted for a larger tool.

Figure 3 is a transverse sectional view as seen on line 33 of Fig. 2.

Figure 4: is a perspective view of the positively adjusted jaw.

Figure 5 is a perspective view of one of the jaws with which the jawshown in Fig. 4 contacts.

In the drawings above briefly described, the numeral 1 designates thebody of the improved tool, said body being here shown provided withoppositely extending handles 2, although one handle would in someinstances suflice. The body 1 and its handles are substantially flat andsaid body is cut entirely through to provide a pair of recesses 3 and 4,and a connecting passage 5 between said recesses. The recess 3 iscomparatively large and is provided with a plurality of straight sides,four being preferably employed. Within the recess 3 and cont-acting withthe straight sides thereof, are adjustable jaw blocks 6, 7, 8, and 9,one block being in sliding contact with each of the straight sides ofthe recess. The several blocks are of ap proximately triangular form andsaid blocks are provided with cam surfaces 6 6 7 7", 8 8 9, and 9 thecam surfaces of each block being in the present showing, positioned atright angles to each other. The face 6 of block 6 contacts with the face7 of the block '7; the faces 7 and 8 of the blocks 7 and 8 are incontact with each other, and the surface 8 of the block 8 contacts withthe surface 9 of. the block 9. It thus follows that when the block 6 isshifted in either direction along its respective straight side of therecess 3, the several cam surfaces act on each other to slide the otherblocks one upon another, and this sliding movement varies the size ofthe space between the sev eral blocks, which space forms the socket forreceiving the shank of a tool to be operated. For adjusting the block 6,I have shown said block provided with a threaded shank 10 which extendsthrough the passage 5 into the recess 4, and located within this recess,is an adjusting nut or screw 11 which is threaded on the shank 10, saidnut or screw being held against longitudinal movement so that when it isturned in one direction or the other, the shank 10 and the block 6 willbe adjusted as required. At its juncture with the block 6, the shank 10is preferably flattened as shown at 12 and this flattened portion isreceived in the notch 13 in the block 9 when the jaws are contracted forapplication of the tool to a relatively small tap or the like.

For retaining the several jaw blocks in the recess 3, a pair ofappropriate plates 14 are secured by screws or the like 15 to oppositesides of the body 1, said plates having openings 16 exposing the severaljaw-blocks for use.

From the foregoing, taken in connection with the accompanying drawing,it will be seen that although I have provided an extremely simple andinexpensive device, it will be highly efficient and in every waydesirable, and since probably the best results may Obtained from theseveral de:

triangular jaw blocks in contact with said straight sides, said jawblocks having CO-QCl'JIlg cam surfaces for moving one by means ofanother, a shank integral mg a body having spaced recesses and a' withonecorner of one of said jaw blocks and extending therefrom through saidpassage and into the relatively small recess, the portion of said shankadjacent said. one jawblock being flattened and thereby reduced in'cross" section, and a nut in said relatively small recess threaded onsaid shank and engaging the recess walls to prevent endwise shifting,one corner of the jaw block adjacentthe shanked endof said oneblockbeingprovided with a notch adapted to straddle the flattenedportion of the shank when the jaw blocks are moved into unusually closerelation with each other.

In, testimony whereof I have hereunto set my hand, 4 i a WARREN W.MARSHALL.

